Burnishing device for preformed channels



Feb. 12, 1952 w. J. PHANEUF BURNISHING DEVICE FOR FREFORMED 'CHANNELS 2 SHEETS- SHEET l Filed July 6, 1949 INVENTOR. i//Ueoss JID/#miur --1 l I I l Feb. 12, 1952 w, 1 PHANEUF 2,585,166

BURNISHING DEVICE FOR PREFORMED CHANNELS Filed July 6, 1949 2 SPEETS-SHEET 2 n. "rl l /0 l INVENTOR. h//L Rass Z PHA/v5 UF.

Patented Feb. 12, 1952 BURNISHING DEVICE Fon PREFORMED CHANNELS Wilrose J. Phaneuf, Hudson, Mass., assigner to The Lapointe Machine Tool Company, Hudson, Mass., a corporation of Maine Application July 6, 1949, Serial No. 103,240

2 Claims.- (Cl. 2li- 90) This invention relates to a device for burnishing the inner wall surfaces of a channel er groove l previously formed in a metal structure, as bya milling or breaching operation.

The invention is capable of general application but is particularly adapted for use in a breaching machine and may desirably be mounted at the finishing end of a sectional breach, so that roughing, finishing and burnishing operations may all be performed during a single stroke of the machine.

It is the general object of the invention to provide a burnishing device having a plurality of burnishing elements or buttons movable bodily and simultaneously through the channel or groove to be breached. Each burnishing element is also freely rotatable on its own axis to distribute Wear thereon.

A further object of the invention is to provide a construction in which the burnishing elements may be readily removed and replaced when desired.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which:

Fig. 1 is a partial plan view of a sectional breach having my improved burnishing device mounted therein;

Fig. 2 is a side elevation of the sectional breach shown in Fig. l;

Fig. 3 is a sectional end elevation, taken along the line 3-3 in Fig. l;

Fig. 4 is a side elevation of a burnishing stand;

Figs. 5 and 6 are plan and end views thereof;V

Fig. 'i is a side elevation of one of the burnishing elements or buttons;

Fig. 8 is a plan view thereof; and

Fig. 9 is an enlarged partial cross section of one design of burnishing element.

My improved burnishing device comprises a block or stand I in which a plurality of burnishing elements or buttons I2 are mounted in aligned relation.

In Figs. l to 3, I have shown the stand I0 mounted in a groove or recess I 4 extending longitudinally of a frame member or broach body I5. The groove I4 extends the whole length ofthe frame member I and is adapted to receive a pilot member 2l), a plurality of roughing cutters 2l, a locking block 22 with a locking wedge 23, a plurality of chamfering cutters 24, an additional locking block 25 and wedge 26, a plurality of n- 2 ishing cutters 2, and a third locking block 28 and wedge 29. End blocks 30 and 3l are also provided, and clamping bars 32 retain the various cutters seated in the longitudinal recess I4. An additional clamping plate 35 is provided for the burnishing stand I0.

When the breach body or frame I5 is mounted in a breaching machine and is caused te move longitudinally adjacent a previously notched piece of work, the pilot member 20 enters the notch and centers the cut. The notch is then reughed out by the roughing cutters 2|, chamfered by the chamfering cutters 24, and cut to nished size by the iinishing cutters 21.

The burnishing elements or buttons I2 are then drawn through the iinished channel or recess. As the buttons lt snugly in the finished opening, the side wallsof the opening are effectively burnished.

As successive burnishing operations are performed, the freely rotatable buttons I2 assume different angular positions, so that the Wear on the buttons is distributed and the formation of flat surfaces thereon is substantially prevented.

The detailed construction of the burnishing stand I0 is shown in Figs. 4 to 6, and the detailed construction of one of the burnishing elements or buttons I2 is shown in Figs. 7 to 9.

The burnishing stand I0 has a plurality oi transverse openings 40 formed therein, and also has a longitudinal notch or groove 4I formed in one side face thereof. Each burnishing element er button I2 has a shank 50 fitting closely in one of the openings 4U but freely rotatable therein. Each element I2 also has a ange 5I which determines the vertical position of said element 0* button in the stand IU.

The shank 50 of each .button has an annular groove 52 which is vertically aligned with the notch 4I in the stand I0 when the parts are assembled. The clamping bar 35 has a double beveled clamping edge as shown in Fig. 3, and this beveled portion of the bar 35 engages the lower surface of the notch 4I (Fig. 6) in the stand I0 and also extends into the annular groove 52 in each shank 50.

The clamping bar thus holds the stand I0 rm- 1y seated in the longitudinal groove or recess I4, and at the same time prevents axial displacement of the burnishing elements.

The upper end of the burnishing element or button l2 varies in cross section in accordance with the particular groove or channel to be burnished. The section shown in Fig. 9, for instance, is adapted to burnish the so-called Christmas tree grooves or channels commonly used in turbine rotors to receive the shanks of the turbine blades.

While I have shown my improved burnishing device as mounted on an elongated broach body or frame and as associated with one or more groups of broaching cutters, this disclosure is illustrative only, and it will be understood that myimproved burnishing device may be used in other combinations or may be used to perform an entirely separate burnishing operation.

use of this invention.

Having thus described my invention andthe advantages thereof, I do not Wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but What I claim is:

1. A burnishing device including a plurality of burnishing elements to be drawn through' a broached channel in a piece of work andeffective to simultaneously burnish the opposite side wallson said frame and engaging said stand in said longitudinal notch and having a portion projecting into the annular groove of each burnishing element to prevent axial displacement of said element, and means to secure said bar in clamping position.

' 1o It is found by actual test that burnished, sur-.- faces of very superior quality are produced by the 2. A burnishing device comprising a rigid stand and a plurality of burnishing elements mounted thereon and to be drawn through a broached channel in a piece of work, said burnishing elements being effective to simultaneously burnish the opposite side Walls of said channel, said stand having a plurality of transverse bearing openings therein which are longitudinally aligned with respect to said channel, each burnishing element being mounted for free rotation in one of said bearing openings and having an axial section closely corresponding to the cross section of said broached channel to be burnished and each burnishing element having a cylindrical bearing portion with an annular groove therein, a clamping bar having a longitudinal edge portion which is V--shaped in cross section and which is seated and fits closely into the annular groove of each burnishing element when said bar is in clamping position and which bar thereby retains each burnishing element in said stand and also prevents any'axial movement of said burnishing element in Said stand, and means to secure said bar in clamping position. y

WILROSE J. PHANEUF.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 353,633 House e Nov. 30, 1886 1,275,006 Eden Aug. 6, 1918 1,441,502 Hook Jan. 9, 1923 2,056,706 Blazek et al Oct. 6, 1936 2,204,537 La Pointe June 11, 1940 2,243,158 Johansson May 27, 1941 2,247,887 Nascimbeni July l, 1941 2,439,822 Phaneuf Apr. 20, 1948 

